Improvement in lifting-jacks



L. MBEKER. 'Lifting-Jack.

Patented DeC. 25; 1877.

ATTORNEYS.

A NPETE-RS PHOTO-LITHOGRAPHER, WASHXNGTON. Dv.C.

NITED STATES PATENT Duuren.

'i LORENZO MEEKER, OF OSWEGO, NEW YORK.

IMPRovl-:Ml-:NTI IN LlgFTlNG-JACKS.

Specificationforming part of Letters Patent No. 198,654, dated December 25, 1877 application filed November 20, 1877.

To all whom it maylconcern: i

Be it known that I, LORENZO MEEKER, of Oswego, in the county of Oswego and State of New York, have invented a new and Improved Lifting-J ack, of which the following is a specication: A l

Figure l is a side elevation, partly in section, of my improved lifting-jack. Fig. 2 is a plan view. Fig. A3 is a detail sectional-view taken on line a a' in Fig. 1. Fig. 4 is a perspective view of a modified form.

Similar letters of reference indicate corresponding-parts.

The object of my invention is to provide a lifting-jack by which a heavy weight may be lifted either from the ground or top of the jack.

The invention consists in the combination of a vertically-sliding bar, a peculiarly-constructed clutching device, and a lever fulcrumed on the tubular standard, by which the vertically-Sliding bar is guided.

Referring to the drawing, A is a tubular standard, secured to a base-piece, `A', 4and having the right-angled arm B projecting out ward and upward from its side, near the top. A bar, (l, having the head a, is fitted to the tubular standard A, and upon it is placed a clutch, D, which consists of a strap, b, bent around the bar G and a lever, c, pivoted between the ends of theV strap. The lever c is connected, by means of straps or connectingrods d, with a bifurcated lever, E, that is fulcrumed onV the arm B. The longer arm of the lever E is formed into a handle, for operating the jack. The head t is bored transversely, and slotted across its upper surface, to receive a hook, F, for supporting the hooked bar G.

The handle of the lever E is raised, and the head of the bar C is placed against the object to be lifted. By pressing down the long arm of the lever E the lever c is made to clutchdnhe bar C, and the object is raised. If the object is near the surface of the ground, the hooked bar Gr is employed in raising it, the hook being placed under the object.

In the modiiication shown in Fig. 4 a bent lever, E', is employed, and two clutch-levers, o', connected by straps b', are used.

lHavin g thus described my invention, I claim as'V new and desire to secure by Letters Patentl. The combination, with the tubular standard and the sliding bar G, of the hand-lever E, the connectingflinks d, and the Vclutch 4D, consistingof a strap partially encompassing the bar C, and a lever or dog, c, pivoted to both the connecting-linksaud the strap, so as to bite the bar C from its movement upon said pivots, substantially as described.

2. The combination of the hook F and hooked rod G with the vertically-sliding bar C of the lifting-jack, substantially as herein shown and described.

LORENZ() MEEKER. Witnesses: A

NORMAN HoLLRY, p E. M; FITZGERALD. 

